An approach to compatible multiple nonlinear vibrational spectroscopy measurements using a commercial sum frequency generation system.
An approach to compatible multiple nonlinear vibrational spectroscopy measurements using a commercial sum frequency generation system.
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DOI：
10.1039/c1an15032d
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
Shuji Ye;Feng Wei
中科院分区：
文献类型：
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作者：
Shuji Ye;Feng Wei
本文设计了一个兼容的多重非线性振动光谱系统，利用商用的EKSPLA和频产生振动光谱（SFG）系统记录了红外-可见和频产生振动光谱（SFG）和红外-红外-可见三泵浦场四波混频（IIV-TPF-FWM）光谱。这是第一次使用皮秒激光脉冲获得IIV-TPF-FWM信号。我们已经应用这个兼容的系统来研究核黄素分子（也称为维生素B2）的表面和振动结构。八种偏振组合的信号频率谱具有非零信号。入射s偏振红外信号比入射p偏振红外信号弱，在双共振条件下，共轭三环的信号大大增强。对于具有入射p偏振IR的IIV-TPF-FWM光谱，只有sspp和pppp偏振组合具有非零信号。IIV-TPF-FWM光谱在1585 cm（-1）处显示出一个非常强的峰，该峰主要由N（5）-C（4a）伸缩控制。在这项研究中开发的方法将有助于研究人员，无论是使用自制或商业（EKSPLA）SFG系统，获得独立和互补的测量SFG光谱和更详细的界面分子的结构信息。
In this paper, we designed a compatible multiple nonlinear vibrational spectroscopy system that can be used for recording infrared-visible sum frequency generation vibrational spectra (SFG) and infrared-infrared-visible three-pump-field four-wave-mixing (IIV-TPF-FWM) spectra using a commercial EKSPLA SFG system. This is the first time IIV-TPF-FWM signals were obtained using picosecond laser pulses. We have applied this compatible system to study the surface and vibrational structures of riboflavin molecules (also known as vitamin B2). The SFG spectra of eight polarization combinations have non-vanishing signals. The signals with incoming s-polarized IR are relatively weaker than the signals with incoming p-polarized IR. Under the double resonant conditions, the SFG signals of the conjugated tricyclic ring are greatly enhanced. For the IIV-TPF-FWM spectra with incoming p-polarized IR, only the sspp and pppp polarization combinations have non-vanishing signals. The IIV-TPF-FWM spectra show a very strong peak at 1585 cm(-1) that is mainly dominated by the N(5)-C(4a) stretch. The method developed in this study will be helpful for researchers, either using a home-built or commercial (EKSPLA) SFG system, to obtain independent and complementary measurements for SFG spectroscopy and more detailed structural information of interfacial molecules.